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. E. BROWN.

TWO CYCLE GAS PUMP AND THE LIKE.

APPLICATION FILED MAYIO m2.

1,19,706. Patented Aug. 15, 1916.

ERIC BROWN, OF BAHNHOFWEG, BADEN, SWITZERLAND.

- TWO-CYCLE GAS-PUMP AND THE LIKE.

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Specification of Letters Patent.

Patented Aug. 15, I916.

, Application filed May 10, 1912. Serial No. 696,541.

To all whom it may concern:

Be it known that I, ERIC BROWN, a subject of the King of Great Britain and Ireland, residing at Bahnhofweg, Baden, Switzerland, has invented ,certain new and useful Improvements in and Relating to Two- Cycle Gas-Pumps and the like, of which the following is a specification.

This invention relates to gas pumps or compressors Working on the two-stroke cycle. In such pumps heretofore proposed, it has been suggested that the fresh mixture enterin the cylinder shall act on the exhaust gases 11 e a piston and drive them out of the cylinder through the exhaust valve. Owing to the fact, however, that the mixture cannot be admitted to the cylinder entirely free from eddies, and further owing to the different specific gravities the exhaust gases being hot while the fresh mixture may be at the temperature of the atmosphere and the length of the time during which the charge and scavenging process proceeds, a mixing of the burnt gases with the fresh mixture is unavoidable and also unburnt gas finds its way to the atmosphere through the exhaust since the exhaust valves are opened during the whole time of charge and longer. The conditions will be but slightly altered if a small amount of scavenging air is blown through the cylinder during the first instants and the mixture subsequently forced 1n.

The present invention consists in an apparatus in which the gas is brought into the cylinder space only on the return stroke of the water column being pumped, so that an escape of the gas through the exhaust valves is no-longer possible, and inwhic'h moreover a mixing with the exhaust gases is prevented by the scavenging of the cylinder with air during the whole or major part of the outstroke or motion of the water column, the mixture thus not participating in the expulsion of the exhaust gases and air being con-f tained in the cylinder only when the inward motion or stroke of the water column commences.

The accompanying diagram illustrates one manner of carrying the invention into effect.

In the form illustrated a main cylinder at is provided with an extension I) of greater diameter communicating with a bend 'c and delivery pipe 03 on one side and a suction valve cylinder 6 on the other. The construction also includes a separate gas'pumping tank.

cylinder An additional part or valve chamber- 9 is provided to the cylinder f carrying a gas cook h, inlet valve 2', automatic valve j and water controlled valve is; The chamber 9 communicates with a ring Z perforated for the escape of gas and arranged in the dome shape end of the cylinder a. The cylinder and extension carry scavenging valves m and n and an exhaust valve 0. Water valves 39 are provided in the cylinder e. The normal level of the water at suction is shown at I, the lowest level reached inside the cylinder at II and the level corresponding to atmospheric pressure at III.

Briefly, the method of operation is efi'ected by means of the charging pump in communication at one end with the delivery pipe, in which pump an auxiliary column derived from the main liquid column oscillates synchronously or nearly so with the main column whereby it draws in gas or fuel mixture and forces the same into the combustion space. I i

In more detail the operation can be considered as follows :In the spherical end of the combustion cylinder there is present a compressed mixture of air and gas, which is ignited by any suitable ignition device. Explosion takes place and the water contained in the pump cylinder is driven through the pipe 0 and (Z into the high level The amount of mixture is so determined that the expanding gas has reached atmospheric pressure when the water level is at III. The kinetic energy given to the water column causes the water not to come to rest but to continue to move in the direction of the delivery pipe.

The suction level of the water is approximately that shown at I. When the water level in the pump cylinder falls below the level I owing to the'static pressure, water from outside flows into the pump through the valves p until the moving column of water comes to rest. The level III must then again be attained. At this level the gases have to come to atmospheric pressure; the exhaust valve 0 opens by 1ts own weight;

scavenging air if necessary under slight pres-.

sure is forced in through the scavenging air valves m and n and the cylinder at freed from all exhaust gases. Since the scavenging air comes into the cylinder from both the top and bottom the scavenging is very thorough. At the same time the level of valves m and a begin to close.

water in the separate gas pump cylinder f begins to fall and the water to flow toward the pipe (13. The suction caused thereby allows gas to enter through the suction valve 2'. The automatic valve 7.? opens owing to its own weight and the valve j is closed. The amount of gas drawn in can be regulated by means of a cock or valve h located in front of the valve 2'. The gas is unable to find its way into the pump cylinder from the bottom since the bend a is always full of water. When the water column in 0 and d begins to swing back the balanced scavenging The last traces of the exhaust gases are expelled and also the air in the space 6. The closure of the exhaust valve takes place only when the returning water column has passed beyond the edge below the exhaust valve. During this time however the water column in the separate gas pump cylinder f has risen and driven the gas contained therein into the spherical end of the expansion space. The

valve 2' closes under the action of its spring 7 and the automatic valve 7' opens the passage. The major part of the gas contained in the cylinder 7 has now been driven into the space 1!. Since the gas is generally lighter than the air or combustion products, it will have the tendency to rise to the top rather than toward the still open exhaust valve. Moreover. the flow into the cylinder is directed upward so that owing to the conditions of admission there is no possibility that gas can escape through the exhaust valve. Owing to the thorough scavenging the gas Will be mixed with pure air only so that the mixture will give a good combustion. To obtain immediately an intimate mixture of the gas and air the gas should be pressed into the expansion space in fine streams and at high speed.

\Vhen the column in the cylinder f has reached the valve it: it will close the same. The remainder of the gas trapped in the cylinder serves as a cushion to take up the still unabsorbed kinetic energy of the column of water in the cylinder l/Vhen the exhaust and scavenging valves are closed the compression of the mixture begins and when it has attained a sufficient intensity ignition takes place in known manner and a new cycle insures. By thus enabling the expansion of the mixture and the scavenging and exhaust to take place during one strok (outswing of the water column) and the admission and compression during the second stroke (inward swing of the column) two cycle gas engines of this kind receive an .with a liquid reservoir, a port at the side of the main chamber adapted for the exit of an elastic fluid, ports respectively above and below said exit port adapted for the entry of air, valves in connection with the auxiliary chamber adapted respectively to close one end of said chamber and to close connection between the main and the auxiliary chambers and an elastic fluid conduit in connection with the auxiliary chamber and a valve for closing the same; as set forth.

2. An internal combustion pump comprising a combustion chamber, a gaseous fuel chamber, a gas inlet to said fuel chamber, a connection between said chambers at the top adapted for the passage of gases, and a connection between said chambers at the bottom adapted for the flow of liquids in either direction, a liquid column part forming a liquid piston in the combustion chamber and part forming a liquid piston in the fuel chamber, the two pistons being driven downward on the outstroke, that in the fuel chamber acting to draw the gaseous fuelinto that chamber during its outstroke and returning in both chambers on the instroke. In testimony whereof. I have afiixed my signature in presence of two witnesses.

ERIC BROWN. lVitnesses:

HERMANN Eio-KLEn, AUGUST HERRINGER. 

